how to use the allkeys function from the underscore library in typescript

To use the allkeys function from the Underscore library in TypeScript, you first need to install the Underscore library, either via npm or by downloading the source code from the Underscore website.

Once you have included the library in your project, you can use the allkeys function to retrieve all the keys of an object. Here's an example:

index.ts
import * as _ from 'underscore';

const person = {
  name: 'John Doe',
  age: 30,
  email: 'johndoe@gmail.com'
};

const keys = _.allKeys(person);
console.log(keys); // Output: ['name', 'age', 'email']
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In the example above, we first import the Underscore library and assign it to the _ variable. Then, we declare an object called person with three properties. Finally, we call the allKeys function with the person object as an argument, which returns an array of all the properties of the object.

Note that you may need to configure your TypeScript compiler to recognize the Underscore library. You can do this by adding the following line to your tsconfig.json file:

{
  "compilerOptions": {
    "types": ["underscore"]
  }
}
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This will inform the TypeScript compiler that you are using the Underscore library, allowing you to use the library's functions in your TypeScript code without errors.